Vanguard International Dividend Appreciation Index Fund Investment Risks - Admiral Prospectus [Member] - Vanguard International Dividend Appreciation Index Fund	Oct. 31, 2025
General Market Risk [Member]
Prospectus [Line Items]
Risk [Text Block]	• General Market Risk. The markets in which the Fund invests can be affected by a variety of factors. These factors, which can be real or perceived, may include economic, market, political, and regulatory conditions and developments as well as local, regional, or global events such as wars, military conflicts, natural disasters, and public health issues. In addition, investor sentiment and expectations regarding these factors can also impact the markets. Different parts of the market, including different industries and sectors as well as different types of securities, may react differently to factors that affect the market. These factors can contribute to market uncertainty, market volatility, and fluctuations in the value of the Fund’s investments, thereby resulting in potential losses to the Fund over short or long periods.
Dividend Investing Risk [Member]
Prospectus [Line Items]
Risk [Text Block]	• Dividend Investing. The Fund’s emphasis on dividend-paying stocks could cause the Fund to underperform other funds that invest without consideration of a company’s track record of paying dividends.
Investing in Foreign Markets Risk [Member]
Prospectus [Line Items]
Risk [Text Block]	• Investing in Foreign Markets. Foreign markets can perform differently than U.S. markets. World events could adversely affect the value and/or liquidity of securities of foreign companies or foreign issuers, potentially in ways that differ from impacts to U.S. companies or issuers. Further, global economies and financial markets are becoming increasingly interconnected, which increases the possibility that conditions in one country or region could adversely impact a different country or region. In addition, the rights and remedies associated with investments in a fund that invests in foreign securities may be different than a fund that invests in domestic securities. To the extent that the Fund invests a large portion of its assets in securities of issuers located primarily in one country or region, the Fund’s performance may be hurt disproportionately by the poor performance of its investments in such country or region.
Emerging Markets Risk [Member]
Prospectus [Line Items]
Risk [Text Block]	• Investing in Emerging Markets. Investments in emerging markets are subject to higher degrees of risk and volatility than investments in developed markets. Compared with developed markets, emerging markets can have greater custodial and operational risks; less developed legal, tax, regulatory, financial reporting, accounting, and recordkeeping systems; and greater political, social, and economic instability than developed markets. In addition, emerging markets generally have less efficient trading markets with lower overall liquidity and more volatile currency exchange rates. Each of these risks can cause losses to the Fund’s investments and/or impact the Fund’s performance.
Currency Risk [Member]
Prospectus [Line Items]
Risk [Text Block]	• Currency Risk. The Fund is subject to the risk that foreign currency will perform differently than U.S. dollars and increase the potential loss to the Fund. Currency exchange rates may be volatile, move rapidly, and change as a result of changes in interest rates, inflation rates, government surpluses or deficits, and monetary policy or currency controls imposed by local governments or supranational entities such as the International Monetary Fund. Changes in currency exchange rates can affect the value of the Fund’s holdings.
Investing in Equity Markets Risk [Member]
Prospectus [Line Items]
Risk [Text Block]	• Investing in Equity Markets. The Fund invests in the equity markets. Equity markets have historically been cyclical, having periods of time when stock values rise and fall. Market volatility can lead to significant fluctuations in stock values, resulting in potential losses to the Fund.
Market Capitalization Risk [Member]
Prospectus [Line Items]
Risk [Text Block]	• Market Capitalization (Market Cap). Companies are generally classified into three types of market cap depending on their size: small-, mid-, and large-cap. Companies can be further classified into micro- or mega-cap. Different factors can affect each market cap uniquely, and historically small- and mid-cap stocks have typically been more volatile due to the effects of changing economic conditions. Large companies may not reach the same levels of growth or performance as smaller companies, and they may be slower to react to competitive challenges. The performance of funds that invest in a subset of market caps could diverge from the performance of a fund that is focused on a broader representation of the stock market.
Index Investing Risk [Member]
Prospectus [Line Items]
Risk [Text Block]	• Index Investing. The Fund is subject to risks associated with index investing. Because the Fund generally seeks to track the performance of the Target Index regardless of how the Target Index is performing, the Fund’s performance may be lower than it would be if it were actively managed. Although the Fund seeks to hold substantially all of the securities included in the Target Index, it may be unable to do so. In addition, the Fund could be prevented from holding one or more securities in the same proportion as in the Target Index.The performance of the Fund’s investments, in the aggregate, may not match the investment performance of the Target Index. This risk, known as tracking error risk, may be heightened during times of increased market volatility or under other unusual market conditions. The Fund also could be negatively impacted by changes to the Target Index made by the Index Provider or by errors made by the Index Provider. Any gains, losses, or costs associated with or resulting from an error made by the Index Provider will generally be borne by the Fund and, as a result, the Fund’s shareholders.
Nondiversification Risk [Member]
Prospectus [Line Items]
Risk [Text Block]	• Nondiversification. By tracking its broad-based Target Index, the Fund could become nondiversified, as defined under the Investment Company Act of 1940, due to events such as an index rebalance or market movement. The performance of nondiversified funds may be negatively impacted by relatively few securities or even a single security and their shares may experience significant fluctuations in value.
Concentration Risk [Member]
Prospectus [Line Items]
Risk [Text Block]	• Concentration Risk. Except as may be necessary to approximate the composition of its Target Index, the Fund will not concentrate its investments in the securities of issuers whose principal business activities are in the same industry or group of industries. If the Target Index becomes concentrated and the Fund needs to concentrate in the same industry or group of industries, its performance could be negatively impacted by the industry or industries in which it is concentrated.
Risk Lose Money [Member]
Prospectus [Line Items]
Risk [Text Block]	As with any investment, an investment in the Fund could lose money over any time period.
Risk Not Insured Depository Institution [Member]
Prospectus [Line Items]
Risk [Text Block]	An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.